Zhang, Xiangqian, and Pengfei  Zhao. “Unified Field Theory: Composition of the Universe, Spacetime Motion and the Invariance of the Speed of Light”. International Journal of Physics Research and Applications 8, no. 7 (July 21, 2025): 222. Accessed October 11, 2025. https://www.physicsresjournal.com/ijpra/article/view/ijpra-aid1129.